package ${initProjectVo.packageNameValue}.common.excel;

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.CollectionUtils;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.poi.ss.usermodel.Cell;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* @author Faye.Wang
* @version 1.0
* @date 2020/12/15 18:16
* @Description
*/
public class CustomCellWriteHandler extends AbstractColumnWidthStyleStrategy {
    private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();

    @Override
    protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<CellData> cellDataList, Cell cell, Head head, Integer integer, Boolean isHead) {
        boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
    if (needSetWidth) {
        Map<Integer, Integer> maxColumnWidthMap = CACHE.get(writeSheetHolder.getSheetNo());
        if (maxColumnWidthMap == null) {
            maxColumnWidthMap = new HashMap<>();
            CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);
        }

    Integer columnWidth = this.dataLength(cellDataList, cell, isHead);
    if (columnWidth >= 0) {
            if (columnWidth > 255) {
                columnWidth = 255;
            }

            Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
            if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
                maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
                writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 10);
            }
            }
        }
    }

    private Integer dataLength(List<CellData> cellDataList, Cell cell, Boolean isHead) {
        if (isHead) {
            return cell.getStringCellValue().getBytes().length;
        } else {
            CellData cellData = cellDataList.get(0);
            CellDataTypeEnum type = cellData.getType();
        if (type == null) {
            return -1;
        } else {
        switch (type) {
            case STRING:
                return cellData.getStringValue().getBytes().length;
            case BOOLEAN:
                return cellData.getBooleanValue().toString().getBytes().length;
            case NUMBER:
                return cellData.getNumberValue().toString().getBytes().length;
            default:
                return -1;
            }
        }
     }
  }
}
